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I dont even know if this is the right term "safe-volume"....but I have just changed to KDE and before I used MATE. In MATE when I plugged in my earphones.....the system immediately set the volume to, more or less, 60%. Which was great to protect my ears from loud noise if I previously had the volume set to 100%.

Is there a way to set this in KDE?

UPDATE. I have found a solution. veromix widget in KDE can be set for headphones.

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Alsa is the underlying control for all of the sound on your computer.

The alsamixer command can adjust all of the "gains" on each of the sound devices. It's a command line command and it will present a visual picture.

enter image description here

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I'm not quite sure if this is that same thing that is being asked. If you reduce the headphone setting in alsamixer, you cannot use the volume keys to reset it to maximum volume. However, if the system modifies the master volume instead (e.g. to 60%), then you can easily use the volume settings to reset it to 100%. I think the OP is talking about a dynamic setting rather than static. (But I'm not sure.) –  Sparhawk Jun 3 '13 at 2:09
    
@Sparhawk yes, that's what I mean. I wanna be able to use 100% of the volume on earphones and speakers too. But I want the system to set the earphone volume to 60% as soon as an earphone or headphone is detected. This way protecting my ears. Is there a way to do this? –  Elysium Jun 3 '13 at 7:09
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